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Texas Instruments LM2575S-12/NOPB
- Part No.:
- LM2575S-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575S-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:755
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Product details
Overview
LM2575S-12/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 12V output, 52 kHz internal oscillator, and integrated power switch. It delivers ±4% output voltage accuracy over 15V–40V input range and 0.2A–1A load, enabling compact, high-efficiency DC/DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the LM2575S-12/NOPB datasheet, LM2575S-12/NOPB pinout, LM2575S-12/NOPB application, or LM2575S-12/NOPB equivalent, this page provides verified technical context, package-specific pin definitions, real-world application mappings, and validated alternative options for design-in and supply continuity planning.
Technical Context
The LM2575S-12/NOPB implements a fixed-frequency, current-mode buck topology with internal 52 kHz oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF control. Its feedback loop uses a precision 1.23V reference and requires no external compensation.
It operates across −40°C to +125°C junction temperature, supports up to 40V input, and delivers regulated 12V output with typical 88% efficiency at 15V input and 1A load. The device integrates a 0.9V saturation voltage power switch and features 50 μA standby current when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% over 15V–40V input and 0.2A–1A load - ensures stable rail for microcontrollers and analog circuitry without external resistors. |
| Max Output Current | 1A continuous - supports single-rail power delivery for mid-power embedded subsystems without external current boosting. |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, standard inductors (e.g., 330 µH) and simplifies EMI filtering versus higher-frequency alternatives. |
| Input Voltage Range | 40V max (LM2575 series) - compatible with 24V industrial bus, automotive battery transients, and unregulated AC/DC outputs. |
| Efficiency | 88% typical at VIN = 15V, IOUT = 1A - reduces thermal load vs linear regulators, often eliminating need for heatsink in TO-263 package. |
| Standby Current | 50 µA typical - enables low-power system sleep modes via TTL-level shutdown pin without auxiliary LDO overhead. |
| Thermal Resistance | θJA = 37°C/W (DDPAK/TO-263, 1 in² copper) - allows 1A operation at ambient up to +85°C with minimal PCB copper area. |
Pinout & Package
LM2575S-12/NOPB is housed in a 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring exposed thermal pad for enhanced heat dissipation and compatibility with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Unregulated DC input supply | Accepts 15V–40V; requires local 100 µF/75V aluminum electrolytic bypass capacitor for stability. |
| 2 - Output | Regulated 12V switching node | Drives external catch diode and LC filter; peak current capability defined by internal switch saturation (0.9V @ 1A). |
| 3 - Ground | Power and signal reference | Must be connected to thermal pad and low-impedance ground plane; critical for EMI control and thermal performance. |
| 4 - Feedback | Output voltage sensing input | Internally tied to 12V output; not user-accessible on fixed versions - eliminates resistor divider layout sensitivity. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables output and reduces quiescent current to 50 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power switch | Reduces BOM count to only 4 external components (inductor, diode, input/output capacitors) - accelerates prototyping and lowers cost. |
| Fixed 52 kHz oscillator | Enables predictable EMI profile and eliminates need for external timing components - simplifies compliance testing. |
| Current-limit & thermal protection | Prevents damage during overload or short-circuit events without external circuitry - improves field reliability in unattended systems. |
| TTL shutdown interface | Supports system-level power sequencing and low-power sleep states using standard logic levels - no level-shifting required. |
| Wide input voltage range | Operates directly from 24V industrial rails or automotive batteries (with transient suppression) - avoids pre-regulation stage. |
Applications
| Industrial PLC Power Supply | Embedded Controller Core Rail |
|---|---|
|
Use Scenario: Provides primary 12V rail for programmable logic controller I/O modules operating from 24V DC field bus. IC Role / Device Role / Timing Role: Step-down regulator delivering stable 12V at up to 1A with line/load regulation <±1%. Use Value: Eliminates need for bulky linear regulator and heatsink while maintaining immunity to 40V transients per IEC 61000-4-4. |
Use Scenario: Powers ARM Cortex-M7 microcontroller and associated peripherals in edge gateway device. IC Role / Device Role / Timing Role: Primary DC/DC converter generating clean 12V intermediate rail feeding downstream LDOs. Use Value: Achieves 88% efficiency at full load, reducing board temperature rise by >15°C vs linear solution and extending component lifetime. |
| Automotive Body Control Module | Test Equipment Auxiliary Supply |
|
Use Scenario: Supplies 12V to CAN transceivers and sensor interfaces in under-hood body control unit. IC Role / Device Role / Timing Role: Buck regulator tolerant of 40V load-dump transients and −40°C to +125°C ambient. Use Value: Meets AEC-Q100 stress requirements when paired with automotive-grade external components and proper PCB layout. |
Use Scenario: Generates isolated 12V rail for analog front-end circuitry in portable multimeter design. IC Role / Device Role / Timing Role: Compact, self-contained switching regulator replacing discrete transistor-based designs. Use Value: Enables battery-powered operation with 50 µA shutdown current, extending runtime in sleep mode by >200 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-12 | TO-220 through-hole package; θJA = 45°C/W (vs. 37°C/W); same electrical specs and pinout. | Preferred for prototyping, manual assembly, or legacy through-hole boards requiring no re-layout. | Select when mechanical mounting or thermal constraints favor leaded packages over surface-mount. |
| LM2596S-12 | Higher 1.5A output rating; 150 kHz switching frequency; requires smaller inductor (68 µH); ±2% output tolerance. | Better suited for space-constrained designs needing higher current or tighter regulation, but increases EMI filtering complexity. | Choose when upgrading output capability or regulation accuracy is required and PCB layout can accommodate higher-frequency noise mitigation. |
Compared with LM2575T-12, LM2575S-12/NOPB offers superior thermal performance in SMT form; compared with LM2596S-12, it trades higher current and tighter tolerance for lower EMI and proven robustness in industrial environments.
Availability
LM2575S-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and automotive electronics requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575S-12/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in reliable, high-volume power conversion solutions.
The LM2575 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators in industrial and embedded power supplies - prioritizing simplicity, thermal resilience, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2575S-12/NOPB?
The LM2575S-12/NOPB has an absolute maximum input voltage of 45V and is specified for continuous operation up to 40V. This makes it suitable for 24V industrial systems with transient overvoltage conditions, provided external clamping (e.g., TVS diode) is used for 40V+ events. The LM2575HV variant extends this to 60V, but LM2575S-12/NOPB remains rated strictly for 40V operation.
Does LM2575S-12/NOPB require external feedback resistors?
No. LM2575S-12/NOPB is a fixed-output version with internal resistor divider network set to 12V. Pin 4 (Feedback) is internally connected and not accessible externally - eliminating layout sensitivity, temperature drift, and component count associated with adjustable variants. This simplifies design and improves long-term output stability.
What is the thermal performance of LM2575S-12/NOPB in its TO-263 package?
In the DDPAK/TO-263 package (KTT0005B), LM2575S-12/NOPB achieves θJA = 37°C/W with 1 in² of PCB copper connected to the thermal pad. At 1A load and 15V input, junction temperature rise is ~33°C above ambient - enabling full-rated operation up to +85°C ambient without forced air or heatsink, unlike the TO-220 variant.
Can LM2575S-12/NOPB be used in automotive applications?
Yes, LM2575S-12/NOPB meets key automotive requirements: −40°C to +125°C operating junction temperature, 40V input capability (compatible with 12V battery systems including load dump), and built-in thermal/current protection. When paired with AEC-Q200 qualified external components and appropriate PCB layout, it is widely deployed in body control modules and infotainment power stages.
What external components are mandatory for LM2575S-12/NOPB operation?
Four mandatory components: (1) input capacitor (100 µF, 75V aluminum electrolytic), (2) output capacitor (330 µF, 25V aluminum electrolytic), (3) catch diode (Schottky, e.g., SR103 or MBR1100), and (4) inductor (330 µH, rated ≥1.15A). These values are validated in TI's Figure 25 schematic and ensure stable regulation, ripple <1%, and thermal safety across the full operating range of LM2575S-12/NOPB.
LM2575S-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2575S-12/NOPB FAQ
1.How can I place an order for LM2575S-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575S-12/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2575S-12/NOPB reliable?
The price and inventory of LM2575S-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575S-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575S-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575S-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575S-12/NOPB?
LM2575S-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575S-12/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2575S-12/NOPB?
For technical support, including LM2575S-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575S-12/NOPB requirements.
6.How does Aetrix verify that LM2575S-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575S-12/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2575S-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575S-12/NOPB?
All LM2575S-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575S-12/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2575S-12/NOPB part is unused and in its original packaging.
Return procedure for LM2575S-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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